Connected: An Internet Encyclopedia
RFC 1422 - 3.4.1 Users and User Agents

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### 3.4.1 Users and User Agents

The term User Agent (UA) is taken from CCITT X.400 Message Handling Systems (MHS) Recommendations, which define it as follows: "In the context of message handling, the functional object, a component of MHS, by means of which a single direct user engages in message handling." In the Internet environment, programs such as rand mh and Gnu emacs rmail are UAs. UAs exchange messages by calling on a supporting Message Transfer Service (MTS), e.g., the SMTP mail relays used in the Internet.

3.4.1.1 Generating and Protecting Component Pairs
3.4.1.2 User Registration
3.4.1.3 CRL Management
3.4.1.4 Facilitating Interoperation

Next: 3.4.1.1 Generating and Protecting Component Pairs

Connected: An Internet Encyclopedia
RFC 1422 - 3.4.1 Users and User Agents